Martensitic Stainless Steel
ALTA 1.4125 Stainless Steel Specification
Steel properties
ALTA 1.4125 / 440C steel is a high Carbon-Chromium martensitic stainless steel. It has moderate corrosion resistance and good strength, high hardness and wear resistance after quenching, good dimensional stability in high or low temperature.
Applications
² Suitable for manufacturing bearings in corrosive media such as sea water, river water, nitric acid, steam and marine
² Suitable for tableware (knives) with good corrosion resistance (magnetic)
² Blades, nozzles, valves, rulers
Chemical composition
Chemical Composition per %
|
C |
Si |
Mn |
P |
S |
Cr |
Mo | Ni |
Cu |
Min. |
0.95 |
|
|
|
|
16.0 |
0.40 |
|
|
Max. |
1.20 |
1.00 |
1.00 |
0.040 |
0.030 |
18.0 |
0.80 | 0.25 |
0.25 |
Basic melting process : |
IM/EAF + LF + VD + (ESR) |
Hardness : |
Max 269 HB (annealed) |
Reduction ratio : |
5 : 1 minimum or required |
Grain size : |
≥ 5.0 per ASTM E112 |
Non-metallic inclusion : |
≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route) |
Ultrasonic Test |
SEP1921, EN 10308, ASTM A388 or agreed methods |
Macro-structure |
As per ASTM E381 |
Straightness / flatness |
≤ 1.5 mm / m (machined), ≤ 2.5 mm / m (black) |
Tolerance |
Per discussed |
Size range (round bars) |
Ø 12 - 500 mm |
Size range (flats, plates) |
30 - 400 mm in thickness max. 1100 mm in width |
Heat treatment
Annealing |
Temperature(°C) |
Hardness |
820 - 900 |
max. 269 HB |
Hot-forming |
Temperature(°C) |
900 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
1000 - 1050 |
Oil |
100 - 300 |
Ac1 | Ac3 | Ar1 | Ar3 | Ms |
780 | 840 | 625 | 715 | 180 |
Coefficient of thermal conductivity : λ W/(m·K)
Temperature °C | 20 |
λ | 29.3 |
Coefficient of linear expansion : α(mm/(mm·°C))
Temperature °C | 20~100 | 20~200 | 20~300 | 20~400 | 20~500 | 20~600 |
Αx 10-6 | 10.50 | 11.00 | 11.00 | 11.50 | 12.00 | 12.40 |
Downloads
-
2024-09-29 Alta 1.4125 SPEC (011 - S6 - T1 ).pdf
끂1 271.08 KB
Features
² High wear resistance
² Moderate corrosion resistance
² Good strength
² Good dimensional stability
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